Background Color spreads to other cells when scrolling

[Gone2TheDogs]

I've looked at other posts, but I didn't see where I went wrong. 

(review attached screenshot for a better understanding)

In my situation, I add background color to row cells where this is an "A" value in the cell. This stands for an aisle in a warehouse.

If you scroll slowly, then the background color stays within the rows with an "A", but if you scroll too fast, the display shows green in various cells. Also, if I clear the grid and rebuild it with new data, the background color is not reset. The previous rows that were green are still green.

What am I missing?

01.Private Sub dgvMain_CellFormatting(sender As Object, e As CellFormattingEventArgs) Handles dgvMain.CellFormatting
02.    If _LeftOrRightConveyor = "LEFT" And e.CellElement.ColumnIndex = AisleColumnLeft_Idx Then
03.        e.CellElement.BackColor = System.Drawing.Color.LightGreen
04.    ElseIf _LeftOrRightConveyor = "RIGHT" And e.CellElement.ColumnIndex = AisleColumnRight_Idx Then
05.        e.CellElement.BackColor = System.Drawing.Color.LightGreen
06.    End If
07.
08.    If e.CellElement.Value = "A" Then
09.        e.CellElement.BackColor = System.Drawing.Color.Lime
10.    End If
11.End Sub

[Hristo]

Hi,

The RadGridView control is virtualized and the cell elements are being reused to show different data items. Detailed information on the UI virtualization is available here:

• https://docs.telerik.com/devtools/winforms/controls/gridview/fundamentals/ui-virtualization
• https://docs.telerik.com/devtools/winforms/controls/gridview/fundamentals/logical-vs.-visual-grid-structure

Due to the virtualization, it is required to provide an Else clause in the formatting events so that the styles set on a cell element are reset when this element gets synchronized with a different data item. You can consider resetting the back color similarly as demonstrated here: https://docs.telerik.com/devtools/winforms/controls/gridview/cells/formatting-cells.

I hope this will help. Let me know if you need further assistance.

Regards,
Hristo
Progress Telerik

[Gone2TheDogs]

Right there in the documentation in plain view. I appreciate your bringing it to my attention. 

[Hristo]

Hello Bob,

I am glad that I managed to help. Let me know if you need further assistance.

Regards,
Hristo
Progress Telerik